export default{
	namespaced:true,
	// 模块的 state 数据
	state: () => ({
	   // 购物车的数组，用来存储购物车中每个商品的信息对象
	   // 每个商品的信息对象，都包含如下 6 个属性：
	   // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
	   cart: JSON.parse(uni.getStorageSync('cart') || '[]')
	}),
	mutations:{
		addToCart(state,goods){
			
			const findResult = state.cart.find((x)=>x.goods_id===goods.goods_id)
			// console.log(findResult)
			if(!findResult)
			{
				state.cart.push(goods)
			}else{
				findResult.goods_count++
			}
			this.commit('m_cart/saveToStorage')
			// uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		saveToStorage(state) {
		   uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		updateGoodsState(state,goods){
			const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
			if(findResult){
				findResult.goods_state=goods.goods_state
				this.commit('m_cart/saveToStorage')
			}
			
		},
		updateGoodsCount(state,goods){
				const findResult=state.cart.find(x=>x.goods_id===goods.goods_id)
				if(findResult){
					findResult.goods_count=goods.goods_count
					this.commit('m_cart/saveToStorage')
				}
			},
		removeGoodsById(state,goods_id){
			state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
			this.commit('m_cart/saveToStorage')
		},
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state=newState)
			this.commit('m_cart/saveToStorage')
		}
		
	},
	getters:{
		total(state){
			// let c =0
			// state.cart.forEach(goods=>c+=goods.goods_count)
			// return c
			return state.cart.reduce((total,item)=>total+=item.goods_count,0)
		},
		checkedCount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+item.goods_count,0)
		},
		checkedGoodsAmount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count*item.goods_price,0).toFixed(2)
		}
	}
}